Android通過json向MySQL中讀寫數據的方法詳解【寫入篇】

本文實例講述了Android通過json向MySQL中寫入數據的方法。分享給大家供大家參考，具體如下：

先說一下如何通過json將Android程序中的數據上傳到MySQL中：

首先定義一個類JSONParser.Java類，將json上傳數據的方法封裝好，可以直接在主程序中調用該類，代碼如下

public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
// function get json from url
// by making HTTP POST
public JSONObject makeHttpRequest(String url, String method,
List<NameValuePair> params) {
// Making HTTP request
try {
// request method is POST
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(params,HTTP.UTF_8));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "UTF-8"));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
Log.d("json", json.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}

主程序中這樣調用：

params = new ArrayList<NameValuePair>();
//這裡可以替換成你自己程序中的一些鍵值對
params.add(new BasicNameValuePair("time", ""+time));
params.add(new BasicNameValuePair("lat", ""+lat));
params.add(new BasicNameValuePair("lon", ""+lon));
params.add(new BasicNameValuePair("encyptiontype",encyptiontype));
params.add(new BasicNameValuePair("rssi",rssi));
params.add(new BasicNameValuePair("name",name));
JSONParser jsonParser = new JSONParser();
//數據的php文件的路徑
String url_up = "******/文件名字.php";
try{
JSONObject json = jsonParser.makeHttpRequest(url_up,"POST", params);
Log.v("uploadsucceed", "uploadsucceed");
}catch(Exception e){
e.printStackTrace();
}

最後就是定義一個接收數據的php文件：

<?php
// array for JSON response
//此處需要將數據庫名和表明還有密碼做相應修改，改成你自己的
$con = mysql_connect("localhost","root",null);
if (!$con) {
die('Could not connect:'.mysql_error() );
}
mysql_select_db("a0722152915", $con);
$response = array();
include("conn.php");
// check for required fields
if (isset($_POST['time']) && isset($_POST['lat']) && isset($_POST['lon'])&& isset($_POST['encyptiontype'])&& isset($_POST['rssi'])&& isset($_POST['name'])) {
$time = $_POST['time'];
$lat = $_POST['lat'];
$lon = $_POST['lon'];
$encyptiontype = $_POST['encyptiontype'];
$rssi = $_POST['rssi'];
$name = $_POST['name'];
$result = mysql_query("INSERT INTO wifi_state(time, lat, lon,encyptiontype,rssi,name) VALUES('$time', '$lat', '$lon','$encyptiontype','$rssi','$name')");
echo $result;
// check if row inserted or not
if ($result) {
// successfully inserted into database
$response["success"] = 1;
$response["message"] = "Product successfully created.";
// echoing JSON response
echo json_encode($response);
} else {
// failed to insert row
$response["success"] = 0;
$response["message"] = "Oops! An error occurred.";
// echoing JSON response
echo json_encode($response);
}
} else {
// required field is missing
$response["success"] = 0;
$response["message"] = "Required field(s) is missing";
// echoing JSON response
echo json_encode($response);
}
?>

注意：如果你的設備中android操作系統是4.0以上的，那麼要在主程序中加上下面一段代碼，才能上傳成功

StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
  .detectDiskReads()
  .detectDiskWrites()
  .detectNetwork() // or .detectAll() for all detectable problems
  .penaltyLog()
  .build());
  StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()
  .detectLeakedSqlLiteObjects()
  .detectLeakedClosableObjects()
  .penaltyLog()
  .penaltyDeath()
  .build());

如果是4.0以下的操作系統當然不用加了

下面是上傳成功後的效果圖：

讀數據的方法講放在下一篇《Android通過json向MySQL中讀寫數據的方法詳解【讀取篇】》中介紹

更多關於Android相關內容感興趣的讀者可查看本站專題：《Android操作json格式數據技巧總結》、《Android數據庫操作技巧總結》、《Android編程之activity操作技巧總結》、《Android文件操作技巧匯總》、《Android編程開發之SD卡操作方法匯總》、《Android開發入門與進階教程》、《Android資源操作技巧匯總》、《Android視圖View技巧總結》及《Android控件用法總結》

希望本文所述對大家Android程序設計有所幫助。